In what order would you like argsort to sort the values -inf, nan, inf?
In numpy 1.0b1 nan is always left where it began:
EXAMPLE 1
>> x
matrix([[ inf],
[ -inf],
[ nan]])
>> x[x.argsort(0),:]
matrix([[ -inf],
[ inf],
[ nan]])
EXAMPLE 2
>> x
matrix([[ nan],
[ inf],
[ -inf]])
>> x[x.argsort(0),:]
matrix([[ nan],
[ -inf],
[ inf]])
I would like nan to be in the middle between -inf and inf.
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